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Negative numbers

To explore add/subtract with negative numbers (use brackets to identify a negative or positive number), then multiplying with negatives involved
by

abbey norman

on 19 October 2012

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Transcript of Negative numbers

Where do we use negative numbers? number order Which card? Choose the correct card from the eight shown to make to sum correct. 0 -9 -1 -3 +5 +2 -4 +7 -2 + -9 = 0 -9 -1 -3 +5 +2 -4 +7 +7 0 -9 -1 -3 +5 +2 -4 +7 9 +2 = 0 -9 -1 -3 +5 +2 -4 +7 2 + +5 = 0 -9 -1 -3 +5 +2 -4 +7 -7 + +2 = -9 + -8 + = 0 -9 -1 -3 +5 +2 -4 +7 -3 + -3 = 0 -9 -1 -3 +5 +2 -4 +7 -5 + -4 = -3 + 0 -9 -1 -3 +5 +2 -4 +7 -5 + -9 = -1 + Evaluating directed number statements


Group task...
On A3 sheets organise your statements under the headings Always, sometimes and never true! Rules Negative numbers Adding and subtracting Questions Examples

3 - 7

3 - 2 - 5

-3 - 5 + 4 -2 What rule?

A packet of biscuits at Tesco's costs £3. At Asda they are twice as much...

It was -30 degrees Celsius in Iceland, the coldest temperature recorded in history was 3 times as cold...

I owed the bank manager 15 lots of £10 installments

Two wrongs make a right???

What is -2 + -2 + -2 + -2 + -2? Starts off hot and gets colder Multiplying and dividing Put the following in order of size from smallest to biggest : 1)5 °C, 3 °C, -5 °C, 0 °C, -8 °C

2)-34 m, 12m, -15m, 1m, -3m

3)2.5, -0.5, -1, 4, -2, -1.5, 0 You MUST consider this table whenever you are MULTIPLYING numbers ! + × + = +
- × - = +
+ × - = -
- × + = - Whats the tallest and lowest thing you see? Examples

5 x 5

-4 x -3

7 x -2

-5 x 8 - × + = - + × - = - - × - = + + × + = + -3 -2 -1 -3 -2 -1 × 3 2 1 0 0 1 2 3 Dividing with negatives
has the same rules... http://www.mymaths.co.uk/tasks/library/loadLesson.asp?title=negatives/negatives2&taskID=1068 Examples

a) -2 - +4 =

b) 7 + -3 =

c) -4 - -5 =

d) -6 - -3 + -2 = Complete the number pattern and shade in Which card?
Tear a piece of paper into 8 sections All: Relate negative numbers to the number line
Most: Develop techniques to use with calculations
Few: Apply negative number rules to calculations
Full transcript